Add card exists method

stripe_utils.py

@@ -73,6 +73,30 @@ class StripeUtils(object):
     def __init__(self):
         self.stripe = stripe
 
+    @handleStripeError
+    def card_exists(self, customer, cc_number, exp_month, exp_year, cvc):
+        token_obj = stripe.Token.create(
+            card={
+                'number': cc_number,
+                'exp_month': exp_month,
+                'exp_year': exp_year,
+                'cvc': cvc,
+            },
+        )
+        cards = stripe.Customer.list_sources(
+            customer,
+            limit=20,
+            object='card'
+        )
+
+        for card in cards.data:
+            if (card.fingerprint == token_obj.card.fingerprint and
+                    int(card.exp_month) == int(exp_month) and
+                        int(card.exp_year) == int(exp_year)
+                ):
+                return True
+        return False
+
     def get_stripe_customer_from_email(self, email):
         customer = stripe.Customer.list(limit=1, email=email)
         return customer.data[0] if len(customer.data) == 1 else None